CN111873802B - Method, apparatus, medium, and device for determining electronic device - Google Patents

Method, apparatus, medium, and device for determining electronic device Download PDF

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Publication number
CN111873802B
CN111873802B CN202010718672.1A CN202010718672A CN111873802B CN 111873802 B CN111873802 B CN 111873802B CN 202010718672 A CN202010718672 A CN 202010718672A CN 111873802 B CN111873802 B CN 111873802B
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resistor
monitoring circuit
resistance value
target
state monitoring
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CN111873802A (en
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刘犬会
颜广博
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Svolt Energy Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The disclosure relates to a method, a device, a medium and equipment for determining an electronic device, which are used for selecting a proper electronic device, realizing monitoring on a power battery and ensuring the safety of the power battery. The method comprises the following steps: determining a target diode to be connected into a battery state monitoring circuit; acquiring a voltage drop value of a target diode; determining a target time period according to the voltage drop value and a preset voltage change rate threshold value; determining the capacity of a target capacitor to be accessed into the battery state monitoring circuit, a first resistance value of a first resistor to be accessed into the battery state monitoring circuit and a second resistance value of a second resistor to be accessed into the battery state monitoring circuit according to the target time period; the anode of the target diode is connected with the anode of the power battery, the first resistor is respectively connected with the cathode of the target diode and one end of the second resistor, the other end of the second resistor is connected with the cathode of the power battery, and the target capacitor is connected in parallel with a branch formed by the first resistor and the second resistor.

Description

Method, apparatus, medium, and device for determining electronic device
Technical Field
The present disclosure relates to the field of batteries, and in particular, to a method, an apparatus, a medium, and a device for determining an electronic device.
Background
With the increase of the energy density of the battery core, the safety problem of the new energy industry is increasingly prominent, and under the general condition, the battery thermal runaway accident is the most harmful to the electric automobile (or the energy storage system). For the situation of thermal runaway accident of battery, the main reason is that the internal short circuit and the external short circuit of the battery cell caused by lithium dendrite generation and the like of the battery cell, so it is a common and effective method to monitor the thermal runaway accident by using the voltage change rate of the battery cell. A BMS (Battery Management System) is a System for managing a Battery as a core component of a Battery System, dynamically monitors voltage, current, temperature, insulation resistance, etc. of the Battery, and performs state estimation, Battery balance Management, thermal Management, contactor control, fault diagnosis, and alarm according to the monitored data. Under the condition that the whole vehicle (or energy storage system) is operated, the BMS can monitor the state of the battery cell in real time so as to monitor the thermal runaway fault. And under the condition that the whole vehicle (or the energy storage system) is dormant, the BMS cannot monitor the state of the battery cell in real time, so that the thermal runaway fault cannot be monitored.
In the related art, in order to monitor thermal runaway of a power battery under the condition that a BMS sleeps, an additional circuit is usually designed to monitor thermal runaway of the power battery under the condition that the BMS sleeps, and if the designed circuit is applied to an actual project, selection of each electronic device in the circuit is particularly important.
Disclosure of Invention
The purpose of the disclosure is to provide a method, a device, a medium and equipment for determining an electronic device, so as to select a proper electronic device, realize monitoring of a power battery and guarantee safety of the power battery.
To achieve the above object, according to a first aspect of the present disclosure, there is provided a method of determining an electronic device in a battery state monitoring circuit, the method comprising:
determining a target diode to be connected into the battery state monitoring circuit;
acquiring a voltage drop value of the target diode;
determining a target time period according to the voltage drop value and a preset voltage change rate threshold value;
determining the capacity of a target capacitor to be accessed into the battery state monitoring circuit, a first resistance value of a first resistor to be accessed into the battery state monitoring circuit and a second resistance value of a second resistor to be accessed into the battery state monitoring circuit according to the target time period;
the anode of the target diode is connected with the anode of a power battery, the first resistor is respectively connected with the cathode of the target diode and one end of the second resistor, the other end of the second resistor is connected with the cathode of the power battery, and the target capacitor is connected in parallel with a branch formed by the first resistor and the second resistor.
Optionally, the determining a target time period according to the voltage drop value and a preset voltage change rate threshold includes:
determining a ratio of the voltage drop value to the preset voltage change rate threshold as the target time period.
Optionally, the product of the capacitance of the target capacitor and the sum of the first resistance value and the second resistance value is equal to the target time period.
Optionally, the first resistance value is greater than a first resistance threshold value, and the second resistance value is greater than a second resistance threshold value.
Optionally, the method further comprises:
determining a third resistance value of a third resistor to be connected into the battery state monitoring circuit and a fourth resistance value of a fourth resistor to be connected into the battery state monitoring circuit, wherein the third resistance value is equal to the first resistance value, and the fourth resistance value is equal to the second resistance value;
the third resistor is connected in series with the fourth resistor, and a branch formed by connecting the third resistor and the fourth resistor in series is connected in parallel with a branch formed by the target diode, the first resistor and the second resistor.
Optionally, the method further comprises:
determining a comparator to be connected to the battery state monitoring circuit;
the first input end of the comparator is connected between the third resistor and the fourth resistor, the second input end of the comparator is connected between the first resistor and the second resistor, the first power supply end of the comparator is connected with the anode of the power battery, and the second power supply end of the comparator is connected with the cathode of the power battery.
Optionally, the method further comprises:
acquiring a working voltage value and a working current value of the comparator;
determining a fifth resistance value of a fifth resistor to be connected into the battery state monitoring circuit according to the working voltage value, the working current value and the voltage value of the power battery;
and the first power supply end of the comparator is connected with the positive electrode of the power battery through the fifth resistor.
According to a second aspect of the present disclosure there is provided an apparatus for determining electronics in a battery condition monitoring circuit, the apparatus comprising:
the first determination module is used for determining a target diode to be connected into the battery state monitoring circuit;
the first acquisition module is used for acquiring the voltage drop value of the target diode;
the second determining module is used for determining a target time period according to the voltage drop value and a preset voltage change rate threshold value;
the third determining module is used for determining the capacity of a target capacitor to be accessed into the battery state monitoring circuit, the first resistance value of a first resistor to be accessed into the battery state monitoring circuit and the second resistance value of a second resistor to be accessed into the battery state monitoring circuit according to the target time period;
the anode of the target diode is connected with the anode of a power battery, the first resistor is respectively connected with the cathode of the target diode and one end of the second resistor, the other end of the second resistor is connected with the cathode of the power battery, and the target capacitor is connected in parallel with a branch formed by the first resistor and the second resistor.
According to a third aspect of the present disclosure, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of the first aspect of the present disclosure.
According to a fourth aspect of the present disclosure, there is provided an electronic device comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method of the first aspect of the disclosure.
According to the technical scheme, the target diode of the battery state monitoring circuit to be accessed is determined, the voltage drop value of the target diode is obtained, the target time period is determined according to the voltage drop value and the preset voltage change rate threshold, and the capacity of the target capacitor of the battery state monitoring circuit to be accessed, the first resistance value of the first resistor of the battery state monitoring circuit to be accessed and the second resistance value of the second resistor of the battery state monitoring circuit to be accessed are determined according to the target time period. The anode of the target diode is connected with the anode of the power battery, the first resistor is respectively connected with the cathode of the target diode and one end of the second resistor, the other end of the second resistor is connected with the cathode of the power battery, and the target capacitor is connected in parallel with a branch formed by the first resistor and the second resistor. Therefore, a proper electronic device can be selected for the circuit according to the setting of the battery state monitoring circuit, the functional requirement for monitoring the battery state can be met, the requirement for low power consumption can be met, and the circuit safety can be guaranteed.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a flow chart of a method of determining electronics in a battery condition monitoring circuit provided according to one embodiment of the present disclosure;
FIG. 2 is a circuit schematic of a battery condition monitoring circuit provided in accordance with one embodiment of the present disclosure;
FIG. 3 is a circuit schematic of a battery condition monitoring circuit provided in accordance with another embodiment of the present disclosure;
fig. 4 is a block diagram of an apparatus for determining electronics in a battery condition monitoring circuit provided in accordance with one embodiment of the present disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
As described in the background art, with the increase of the cell energy density, the safety problem in the new energy industry is increasingly prominent, and generally, the battery thermal runaway accident is the most harmful to the electric vehicle (or the energy storage system). For the situation of thermal runaway accident of battery, the main reason is that the internal short circuit and the external short circuit of the battery cell caused by lithium dendrite generation and the like of the battery cell, so it is a common and effective method to monitor the thermal runaway accident by using the voltage change rate of the battery cell. The BMS, which is a core component of a battery system, is a system for managing a battery, dynamically monitors voltage, current, temperature, insulation resistance, etc. of the battery, and performs state estimation, battery equalization management, thermal management, contactor control, fault diagnosis, and alarm according to the monitored data. Under the condition that the whole vehicle (or energy storage system) is operated, the BMS can monitor the state of the battery cell in real time so as to monitor the thermal runaway fault. And under the condition that the whole vehicle (or the energy storage system) is dormant, the BMS cannot monitor the state of the battery cell in real time, so that the thermal runaway fault cannot be monitored.
In the related art, in order to monitor thermal runaway of a power battery under the condition that a BMS sleeps, an additional circuit is usually designed to monitor thermal runaway of the power battery under the condition that the BMS sleeps, and if the designed circuit is applied to an actual project, selection of each electronic device in the circuit is particularly important.
In order to solve the above problems, the present disclosure provides a method, an apparatus, a medium, and a device for determining an electronic device, so as to select an appropriate electronic device for a battery state monitoring circuit, thereby monitoring a power battery and ensuring the safety of the power battery.
Fig. 1 is a flow chart of a method of determining electronics in a battery condition monitoring circuit provided according to one embodiment of the present disclosure.
Before the aspects of the present disclosure are introduced, a battery state monitoring circuit according to the present disclosure will be explained first. The battery state monitoring circuit according to the present disclosure is used to monitor the state of a battery under the state of BMS dormancy, that is, has a function capable of monitoring thermal runaway with low power consumption under the BMS dormancy operating condition. Therefore, the battery state monitoring circuit has the following functions:
1) the power consumption is low: the battery state monitoring circuit only works in the sleep state of the whole vehicle, and the circuit is simple;
2) possess the time record function: the RC circuit is adopted to realize the recording of time;
3) the method has the history recording function: recording voltage by adopting a capacitor to realize the recording of historical voltage;
4) the method has a thermal runaway prediction function.
For example, after the electronic devices in the battery state monitoring circuit are connected, the battery state monitoring circuit can be as shown in fig. 2. In fig. 2, the battery state monitoring circuit includes a diode D1, a resistor R1 and a resistor R2, wherein the anode of the diode D1 is connected to the anode of the power battery, the resistor R1 is respectively connected to the cathode of the diode and one end of the resistor R2, and the other end of the resistor R2 is connected to the cathode of the power battery. In addition, the battery state monitoring circuit may further include a resistor R3 and a resistor R4 connected in series with each other. The battery state monitoring circuit can also comprise a capacitor C which is connected in parallel with a branch formed by the resistor R1 and the resistor R2. The diode D1, the Resistor R1, the Resistor R2, and the capacitor C form an RC circuit (Resistor-capacitor circuit) for realizing the time recording function. Meanwhile, the total voltage at two ends of the resistor R1 and the resistor R2 is recorded by the capacitor C, so that the history voltage can be recorded. Two input ends of the comparator CO are respectively connected between R1 and R2 and between R3 and R4, and a signal received by the signal receiving end from the comparator CO can reflect the voltage difference between the two input ends of the comparator CO, so that the battery state can be known.
For another example, after the electronic devices in the battery state monitoring circuit are connected, the battery state monitoring circuit may be as shown in fig. 3. Fig. 3 is a further design for fig. 2. In fig. 3, a comparator CO is used to compare the voltage at its non-inverting input terminal with the voltage at its inverting input terminal (which can be obtained from the signal output from the comparator output terminal) to determine whether a thermal runaway fault has occurred. If the voltage at the positive phase input end of the comparator CO is greater than or equal to the voltage at the negative phase input end of the comparator CO, it indicates that the voltage change rate is within the normal range, and if the voltage at the positive phase input end of the comparator CO is less than the voltage at the negative phase input end of the comparator CO, it indicates that the voltage change rate is abnormal and a thermal runaway fault may occur.
Taking the battery state monitoring circuits shown in fig. 2 and 3 as an example, the present disclosure aims to select electronic devices (e.g., diodes, resistors, comparators, etc.) therein, connect the electronic devices into a complete circuit as shown in fig. 2 and 3 after determining the appropriate electronic devices, and use the complete circuit for battery state monitoring.
Turning now to fig. 1, as shown in fig. 1, the method provided by the present disclosure may include the steps of:
in step 11, a target diode to be connected to the battery state monitoring circuit is determined;
in step 12, obtaining a voltage drop value of a target diode;
in step 13, determining a target time period according to the voltage drop value and a preset voltage change rate threshold;
in step 14, according to the target time period, the capacity of the target capacitor to be connected to the battery state monitoring circuit, the first resistance value of the first resistor to be connected to the battery state monitoring circuit, and the second resistance value of the second resistor to be connected to the battery state monitoring circuit are determined.
The anode of the target diode is connected with the anode of the power battery, the first resistor is respectively connected with the cathode of the target diode and one end of the second resistor, the other end of the second resistor is connected with the cathode of the power battery, and the target capacitor is connected in parallel with a branch formed by the first resistor and the second resistor. Here, the target diode corresponds to the diode D1 in fig. 2 and 3, the first resistor corresponds to the resistor R1 in fig. 2 and 3, the second resistor corresponds to the resistor R2 in fig. 2 and 3, and the target capacitance corresponds to the capacitor C in fig. 2 and 3.
When the target diode to be connected to the battery state monitoring circuit is determined, the determined target diode is high-voltage resistant and stable in voltage drop, and can work for a long time, so that the battery state monitoring circuit can work stably.
After the target diode is determined, the voltage drop value can be directly obtained due to the inherent property that the diode has the voltage drop. Therefore, the voltage drop value of the target diode can be directly acquired.
The preset voltage change rate threshold may be freely set according to actual requirements, or may be set according to empirical values.
Thus, based on the voltage drop value and the preset voltage change rate threshold, the target time period may be determined. For example, a ratio of the voltage drop value and a preset voltage change rate threshold may be determined as the target time period.
In step 14, according to the target time period, the capacity of the target capacitor to be connected to the battery state monitoring circuit, the first resistance value of the first resistor to be connected to the battery state monitoring circuit, and the second resistance value of the second resistor to be connected to the battery state monitoring circuit are determined.
After the target time period is determined, according to the characteristics of the RC circuit, the first resistor, the second resistor and the capacitor with proper resistance values and capacity can be further selected according to the target time period. And the product of the capacity of the target capacitor and the sum of the first resistance value and the second resistance value is equal to the target time period.
In addition, on the basis, the first resistance value can be larger than the first resistance value threshold value, and the second resistance value can be larger than the second resistance value threshold value. The first resistance threshold and the second resistance threshold may be set according to an empirical value, and the values of the first resistance threshold and the second resistance threshold may be the same or different. Therefore, the resistance values of the first resistor and the second resistor are set to be larger, so that the current in the battery state monitoring circuit can be smaller, and the low consumption of circuit energy is facilitated. For example, the battery state monitoring circuit can be operated at the μ a level all the time by setting the first resistance value and the second resistance value, so as to reduce the energy consumption of the circuit.
And when selecting first resistance and second resistance, should make both satisfy the condition that high pressure resistant, can stably work to make battery state monitoring circuit can stably work.
Optionally, the method provided by the present disclosure may further include the steps of:
and determining a third resistance value of a third resistor to be connected into the battery state monitoring circuit and a fourth resistance value of a fourth resistor to be connected into the battery state monitoring circuit.
The third resistor and the fourth resistor are connected in series, and a branch formed by connecting the third resistor and the fourth resistor in series is connected in parallel with a branch formed by the target diode, the first resistor and the second resistor. Here, the third resistance corresponds to the resistance R3 in fig. 2 and 3, and the fourth resistance corresponds to the resistance R4 in fig. 2 and 3.
In order to enable the battery state monitoring circuit to have the thermal runaway prediction function, the third resistance value should be equal to the first resistance value, and the fourth resistance value should be equal to the second resistance value. Because the third resistance is equal to the first resistance, and the fourth resistance is equal to the second resistance, the voltage change rates of the branches where the third resistance and the second resistance are located should be correspondingly equal, so that whether the thermal runaway fault occurs in the battery can be determined according to the voltage change rates.
In addition, when the third resistor and the fourth resistor are selected, the third resistor and the fourth resistor should meet the conditions of high voltage resistance and stable operation, so that the battery state monitoring circuit can stably operate.
Optionally, the method provided by the present disclosure may further include the steps of:
and determining a comparator to be connected into the battery state monitoring circuit.
The first input end of the comparator is connected between the third resistor and the fourth resistor, the second input end of the comparator is connected between the first resistor and the second resistor, the first power supply end of the comparator is connected with the positive pole of the power battery, and the second power supply end of the comparator is connected with the negative pole of the power battery. Here, the comparator corresponds to the comparator CO in fig. 2 and 3, the first input terminal of the comparator is a non-inverting input terminal of the comparator, and the second input terminal of the comparator is an inverting input terminal of the comparator.
When the comparator is selected, the comparator should meet the conditions of high voltage resistance, long-time stable operation, low working power and the like, so that the battery state monitoring circuit can stably operate and has low power consumption.
Further, the comparator and the positive electrode of the power battery can be connected through a resistor, so that the power consumption of the comparator is further reduced. Accordingly, the method provided by the present disclosure may further comprise the steps of:
acquiring a working voltage value and a working current value of the comparator;
and determining a fifth resistance value of a fifth resistor to be connected into the battery state monitoring circuit according to the working voltage value, the working current value and the voltage value of the power battery.
And the first power supply end of the comparator is connected with the positive electrode of the power battery through a fifth resistor. Here, the fifth resistance corresponds to the resistance R5 in fig. 2 and 3.
The working voltage value and the working current value of the comparator are inherent properties of the comparator, and can be directly obtained while the comparator is determined.
For example, the fifth resistance value R50 of the fifth resistor may be determined by the following formula:
Figure BDA0002599148640000101
wherein, E is the maximum voltage (directly available) of the power battery, V0 is the working voltage value of the comparator, and I is the working current value of the comparator.
In addition, when the fifth resistor is selected, the fifth resistor should meet the conditions of high voltage resistance and stable operation, so that the battery state monitoring circuit can stably operate.
In addition, not limited to the various electronic devices described above, the present disclosure provides a scheme that can select various electronic devices required in the battery state monitoring circuit, and can flexibly select the electronic devices according to actual requirements of the circuit. Taking the battery state monitoring circuit shown in fig. 3 as an example, appropriate resistors R6, R7, R8 may be selected, and a high voltage withstanding condition may be followed when the resistors R6, R7, R8 are selected. As another example, a suitable led (e.g., a led connected in series between the positive input terminal of the comparator CO and the +5V power supply in fig. 3) may be selected for the battery state monitoring circuit to satisfy the conditions of high voltage resistance and stable operation. For another example, a suitable optocoupler device (e.g., a light emitting diode and an optocoupler switch packaged together near the resistor R8 and the resistor R9 in fig. 3) may be selected for the battery status monitoring circuit, and an optocoupler device with good sealing performance and no light transmission may be selected. As another example, appropriate transistors (e.g., transistors K1 and K2 of FIG. 3) may be selected for the battery condition monitoring circuit to meet the high voltage withstand condition.
According to the technical scheme, the target diode of the battery state monitoring circuit to be accessed is determined, the voltage drop value of the target diode is obtained, the target time period is determined according to the voltage drop value and the preset voltage change rate threshold, and the capacity of the target capacitor of the battery state monitoring circuit to be accessed, the first resistance value of the first resistor of the battery state monitoring circuit to be accessed and the second resistance value of the second resistor of the battery state monitoring circuit to be accessed are determined according to the target time period. The anode of the target diode is connected with the anode of the power battery, the first resistor is respectively connected with the cathode of the target diode and one end of the second resistor, the other end of the second resistor is connected with the cathode of the power battery, and the target capacitor is connected in parallel with a branch formed by the first resistor and the second resistor. Therefore, a proper electronic device can be selected for the circuit according to the setting of the battery state monitoring circuit, the functional requirement for monitoring the battery state can be met, the requirement for low power consumption can be met, and the circuit safety can be guaranteed.
Fig. 4 is a block diagram of an apparatus for determining electronics in a battery condition monitoring circuit provided in accordance with one embodiment of the present disclosure. As shown in fig. 4, the apparatus 40 may include:
a first determining module 41, configured to determine a target diode to be connected to the battery state monitoring circuit;
a first obtaining module 42, configured to obtain a voltage drop value of the target diode;
a second determining module 43, configured to determine a target time period according to the voltage drop value and a preset voltage change rate threshold;
a third determining module 44, configured to determine, according to the target time period, a capacity of a target capacitor to be connected to the battery state monitoring circuit, a first resistance value of a first resistor to be connected to the battery state monitoring circuit, and a second resistance value of a second resistor to be connected to the battery state monitoring circuit;
the anode of the target diode is connected with the anode of a power battery, the first resistor is respectively connected with the cathode of the target diode and one end of the second resistor, the other end of the second resistor is connected with the cathode of the power battery, and the target capacitor is connected in parallel with a branch formed by the first resistor and the second resistor.
Optionally, the second determining module 43 is configured to determine a ratio of the voltage drop value and the preset voltage change rate threshold as the target time period.
Optionally, the product of the capacitance of the target capacitor and the sum of the first resistance value and the second resistance value is equal to the target time period.
Optionally, the first resistance value is greater than a first resistance threshold value, and the second resistance value is greater than a second resistance threshold value.
Optionally, the apparatus 40 further comprises:
a fourth determining module, configured to determine a third resistance value of a third resistor to be connected to the battery state monitoring circuit and a fourth resistance value of a fourth resistor to be connected to the battery state monitoring circuit, where the third resistance value is equal to the first resistance value, and the fourth resistance value is equal to the second resistance value;
the third resistor is connected in series with the fourth resistor, and a branch formed by connecting the third resistor and the fourth resistor in series is connected in parallel with a branch formed by the target diode, the first resistor and the second resistor.
Optionally, the apparatus 40 further comprises:
the fifth determining module is used for determining a comparator to be connected into the battery state monitoring circuit;
the first input end of the comparator is connected between the third resistor and the fourth resistor, the second input end of the comparator is connected between the first resistor and the second resistor, the first power supply end of the comparator is connected with the anode of the power battery, and the second power supply end of the comparator is connected with the cathode of the power battery.
Optionally, the apparatus 40 further comprises:
the second acquisition module is used for acquiring the working voltage value and the working current value of the comparator;
the sixth determining module is used for determining a fifth resistance value of a fifth resistor to be connected to the battery state monitoring circuit according to the working voltage value, the working current value and the voltage value of the power battery;
and the first power supply end of the comparator is connected with the positive electrode of the power battery through the fifth resistor.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
The present disclosure also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of determining an electronic component in a battery state monitoring circuit according to any of the embodiments of the present disclosure.
The present disclosure also provides an electronic device, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to perform the steps of the method of determining electronics in a battery condition monitoring circuit according to any of the embodiments of the present disclosure.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (9)

1. A method of determining an electronic device in a battery condition monitoring circuit, the method comprising:
determining a target diode to be connected into the battery state monitoring circuit;
acquiring a voltage drop value of the target diode;
determining a target time period according to the voltage drop value and a preset voltage change rate threshold value;
determining the capacity of a target capacitor to be accessed into the battery state monitoring circuit, a first resistance value of a first resistor to be accessed into the battery state monitoring circuit and a second resistance value of a second resistor to be accessed into the battery state monitoring circuit according to the target time period;
the anode of the target diode is connected with the anode of a power battery, the first resistor is respectively connected with the cathode of the target diode and one end of the second resistor, the other end of the second resistor is connected with the cathode of the power battery, and the target capacitor is connected in parallel with a branch formed by the first resistor and the second resistor;
the method further comprises the following steps:
determining a third resistance value of a third resistor to be connected into the battery state monitoring circuit and a fourth resistance value of a fourth resistor to be connected into the battery state monitoring circuit, wherein the third resistance value is equal to the first resistance value, and the fourth resistance value is equal to the second resistance value;
the third resistor is connected in series with the fourth resistor, and a branch formed by connecting the third resistor and the fourth resistor in series is connected in parallel with a branch formed by the target diode, the first resistor and the second resistor.
2. The method of claim 1, wherein determining a target time period based on the voltage drop value and a preset voltage rate of change threshold comprises:
determining a ratio of the voltage drop value to the preset voltage change rate threshold as the target time period.
3. The method of claim 1, wherein a product of a capacitance of the target capacitor and a sum of the first resistance value and the second resistance value is equal to the target time period.
4. The method of claim 3, wherein the first resistance value is greater than a first resistance threshold value and the second resistance value is greater than a second resistance threshold value.
5. The method of claim 1, further comprising:
determining a comparator to be connected to the battery state monitoring circuit;
the first input end of the comparator is connected between the third resistor and the fourth resistor, the second input end of the comparator is connected between the first resistor and the second resistor, the first power supply end of the comparator is connected with the anode of the power battery, and the second power supply end of the comparator is connected with the cathode of the power battery.
6. The method of claim 5, further comprising:
acquiring a working voltage value and a working current value of the comparator;
determining a fifth resistance value of a fifth resistor to be connected into the battery state monitoring circuit according to the working voltage value, the working current value and the voltage value of the power battery;
and the first power supply end of the comparator is connected with the positive electrode of the power battery through the fifth resistor.
7. An apparatus for determining an electronic component in a battery condition monitoring circuit, the apparatus comprising:
the first determination module is used for determining a target diode to be connected into the battery state monitoring circuit;
the first acquisition module is used for acquiring the voltage drop value of the target diode;
the second determining module is used for determining a target time period according to the voltage drop value and a preset voltage change rate threshold value;
the third determining module is used for determining the capacity of a target capacitor to be accessed into the battery state monitoring circuit, the first resistance value of a first resistor to be accessed into the battery state monitoring circuit and the second resistance value of a second resistor to be accessed into the battery state monitoring circuit according to the target time period;
the anode of the target diode is connected with the anode of a power battery, the first resistor is respectively connected with the cathode of the target diode and one end of the second resistor, the other end of the second resistor is connected with the cathode of the power battery, and the target capacitor is connected in parallel with a branch formed by the first resistor and the second resistor;
the device further comprises:
a fourth determining module, configured to determine a third resistance value of a third resistor to be connected to the battery state monitoring circuit and a fourth resistance value of a fourth resistor to be connected to the battery state monitoring circuit, where the third resistance value is equal to the first resistance value, and the fourth resistance value is equal to the second resistance value;
the third resistor is connected in series with the fourth resistor, and a branch formed by connecting the third resistor and the fourth resistor in series is connected in parallel with a branch formed by the target diode, the first resistor and the second resistor.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
9. An electronic device, comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to carry out the steps of the method of any one of claims 1 to 6.
CN202010718672.1A 2020-07-23 2020-07-23 Method, apparatus, medium, and device for determining electronic device Active CN111873802B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0621148A2 (en) * 1993-04-21 1994-10-26 Matsushita Electric Industrial Co., Ltd. Air-conditioning apparatus for electric vehicle
WO2011001649A1 (en) * 2009-06-30 2011-01-06 パナソニック株式会社 Electric power supply device
CN203732605U (en) * 2013-12-27 2014-07-23 宁波三星电气股份有限公司 Battery voltage detecting circuit
CN109450052A (en) * 2018-12-28 2019-03-08 蜂巢能源科技有限公司 Charge wake-up system
CN110649810A (en) * 2019-08-15 2020-01-03 华为技术有限公司 DC-DC conversion circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0621148A2 (en) * 1993-04-21 1994-10-26 Matsushita Electric Industrial Co., Ltd. Air-conditioning apparatus for electric vehicle
WO2011001649A1 (en) * 2009-06-30 2011-01-06 パナソニック株式会社 Electric power supply device
CN203732605U (en) * 2013-12-27 2014-07-23 宁波三星电气股份有限公司 Battery voltage detecting circuit
CN109450052A (en) * 2018-12-28 2019-03-08 蜂巢能源科技有限公司 Charge wake-up system
CN110649810A (en) * 2019-08-15 2020-01-03 华为技术有限公司 DC-DC conversion circuit

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